"Disk not ejected properly" on Sleep

I'm seeing the same issue as this thread Disk Not Ejected Properly SLEEP ISSUE High Sierra 10.13.3

(for some reason the website won't let me add to that thread - it insisted I start a new one)

A couple things to add are:

1. I'm seeing it for disks with are connected through a Belkin Thunderbolt dock

2, Strangely enough, I see the message for disks that were mounted before the sleep, and also for disks that had been previously unmounted. Of the below three only one was actually mounted - the other two are SD cards which had been mounted through a connected card reader, but had been ejected after use.

Thunderbolt Bus:

Vendor Name: Apple Inc.

Device Name: iMac

UID: 0x00010011009AE0E0

Route String: 0

Firmware Version: 26.1

Domain UUID: 7BEBA466-B61B-0D59-A8DD-9482622AAF45

Port:

Status: Device connected

Link Status: 0x2

Speed: Up to 20 Gb/s x1

Current Link Width: 0x2

Receptacle: 1

Link Controller Firmware Version: 0.14.0

Port:

Status: No device connected

Link Status: 0xe00002eb

Speed: Up to 10 Gb/s x2

Current Link Width: 0x1

Receptacle: 2

Link Controller Firmware Version: 0.14.0

Thunderbolt 2 Express Dock HD:

Vendor Name: Belkin International, Inc.

Device Name: Thunderbolt 2 Express Dock HD

Vendor ID: 0x13

Device ID: 0x85

Device Revision: 0x1

UID: 0x0013107170CA3400

Route String: 1

Firmware Version: 25.1

Port (Upstream):

Status: Device connected

Link Status: 0xe00002eb

Speed: Up to 20 Gb/s x1

Current Link Width: 0x2

Link Controller Firmware Version: 0.14.0

Port:

Status: Device connected

Link Status: 0xe00002eb

Speed: Up to 10 Gb/s x1

Current Link Width: 0x1

Link Controller Firmware Version: 0.14.0

Clarett8Pre:

Vendor Name: Focusrite

Device Name: Clarett8Pre

Vendor ID: 0x12

Device ID: 0xA

Device Revision: 0x1

UID: 0x001200000000B7F0

Route String: 301

Firmware Version: 7.1

Port (Upstream):

Status: Device connected

Link Status: 0xe00002eb

Speed: Up to 10 Gb/s x1

Port Micro Firmware Version: 2.0.7